public async Task <bool> DeleteItem(TodoItem ti)
        {
            string    uri = "https://localhost:44374/api/Todo/" + ti.Id;
            WSManager mgr = new WSManager();

            return(await mgr.HTTPDelete(uri, ti));
        }
        public async Task <bool> PostItem(TodoItem ti)
        {
            string    uri = "https://localhost:44374/api/Todo";
            WSManager mgr = new WSManager();

            return(await mgr.HTTPPost(uri, ti));
        }
        public async Task <TodoItem> GetItem(int id)
        {
            WSManager mgr = new WSManager();
            TodoItem  ret;
            string    uri = "https://localhost:44374/api/Todo/2";

            ret = await mgr.HTTPGet <TodoItem>(uri);

            return(ret);
        }
        public async Task <BindingList <TodoItem> > GetItemList()
        {
            WSManager mgr = new WSManager();
            BindingList <TodoItem> ret;
            string uri = "https://localhost:44374/api/Todo/";

            ret = await mgr.HTTPGet <BindingList <TodoItem> >(uri);

            return(ret);
        }